The result will be seen as an early indication of the mood in the party ahead of the announcement tomorrow of the new Labour leader.

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Sadiq Khan has been named as Labour's candidate to stand to be London Mayor in elections in May next year

All of Labour's members, affiliated supporters and registered supporters in London were entitled to take part in the vote to choose the party's candidate for the 2016 mayoral race.

Mr Khan was ahead in every round of voting, and in the final round beat Tessa Jowell by 58.9 per cent to 41.1 per cent.

Notably in the final run-off he was ahead in every group of voters, including full members, registered supporters and affiliated supporters including union members.

Accepting his nomination at London's Festival Hall, a tieless Mr Khan promised: 'Together we can build a fairer city, a healthier city and, importantly, a city of opportunity.

'I will repay the faith so many have placed in me today. I will devote all my energies in our campaign to win back City Hall - winning for a purpose.

I will stand by the values so many of us share - fairness, ambition and opportunity.

'Together we can make a difference. Together we can fight for all Londoners. Together we can win. Together we can change London.'

Mr Khan is a former human rights lawyer who was elected as MP for Tooting in 2005.

He served as a minister Gordon Brown, becoming the first Muslim to attend Cabinet as a transport minister.

After the 2010 election he helped run Ed Miliband's successful leadership campaign and become shadow justice secretary - a role he held until after the 2015 election when he quit to launch his bid for City Hall.

Victory for Mr Khan will be seen as confirmation of Labour's lurch to the left after he personally nominated Jeremy Corbyn to be leader.

Defeat for Ms Jowell, who was credited with bringing the 2012 Olympics to the capital in 2012, will be seen as a final nail in the coffin for the Blairite wing of the party.

In a sign of the move to the left, Mr Khan's triumph was immediately welcomed by union leaders.

Paul Maloney, regional secretary of the GMB union said: 'This is a convincing win for Sadiq.

We now want to see all parts of the party uniting to secure a win in the election next year.'

Peter Kavanagh, Unite's London and south east regional secretary, said: 'The selection of Sadiq Khan to be Labour's mayoral candidate is a vindication of the progressive polices he set out during the campaign.

'On housing, transport and employment Sadiq offered a positive vision that will deliver the change Londoners are crying out for and with Sadiq as Labour's candidate I am sure we will win.'